Mulan

Finally Disney has an animated film where the girl is not a princess,
a mermaid or a lovelorn little thing waiting for a man to come to her
rescue. In Mulan, the girl is tough, courageous and ends up
leading Chinese soldiers in a victory against the attacking Huns.
Although she does have to disguise herself as guy to initially be taken
seriously.

This tale of the women-in-disguise who turns out to be more
man than any man could possibly be is based on an ancient Chinese
legend that's as well-known in that country as the story of Snow White
is in ours.